Abstract A printing hammer with a lesser length damper in juxtapositional relationship, which damper provides vibration damping of the printing hammer. High speed line printers utilizing impact printing means are often limited to a maximum speed due to the spring response and continued vibration of the printing hammers. The printing hammer taught by the instant invention incorporates a lesser length damper in juxtapositional relationship to provide vibration damping by having the damper vibrate at a natural frequency different from that of the printing hammer. During the actuation of the printing hammer, the mass of both the printing hammer and the damper strike the print surface. Subsequently, the printing hammer and the damper will vibrate in opposition to one another to rapidly effect a damping action. A damper length which is approximately 0.707 times the length of the printing hammer provides the damper with a natural frequency twice that of the printing hammer. Other means for providing differing vibration frequencies are anticipated.
Inventors
👤 S Rose
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-31 12:33
CPC Classifications
B; B41; B41J; B41J9/00; B41J9/26; B41J9/36
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
165 words
In a printer for printing characters by an impact printing technique, the improvement comprising: a plurality of cantilevered fingers extending from a base and forming impact hammers, each including a flat surface extending substantially its entire length and each formed from magnetically attractable material and having a length to provide a predetermined natural vibratory frequency; a plurality of cantilevered fingers extending from said base and forming dampers of magnetically attractable material, each damper including a flat surface extending its entire length, the flat surface of each damper contacting the flat surface of a different one of said hammers throughout the length of said damper, clamping means clamping each damper in contact with a different one of said hammers at said base, said dampers having a length to provide a natural vibratory frequency different from said predetermined frequency; a plurality Of electromagnets, each positioned adjacent a different one of said hammers to attract, when energized, the adjacent hammer and damper in contact with said adjacent hammer.
Claim 2
Dependent Claim
165 words
In a printer for printing characters by an impact printing technique, the improvement comprising: a plurality of cantilevered fingers extending from a base and forming impact hammers, each including a flat surface extending substantially its entire length and each formed from magnetically attractable material and having a length to provide a predetermined natural vibratory frequency; a plurality of cantilevered fingers extending from said base and forming dampers of magnetically attractable material, each damper including a flat surface extending its entire length, the flat surface of each damper contacting the flat surface of a different one of said hammers throughout the length of said damper, clamping means clamping each damper in contact with a different one of said hammers at said base, said dampers having a length to provide a natural vibratory frequency different from said predetermined frequency; a plurality Of electromagnets, each positioned adjacent a different one of said hammers to attract, when energized, the adjacent hammer and damper in contact with said adjacent hammer.
Claim 3
Dependent Claim
21 words
The combination set forth in claim 1, wherein each of said dampers is approximately 0.707 times the length of said dampers.